package com.shop.service.impl;

import com.shop.service.ReportService;
import com.shop.service.WorkspaceService;
import com.shop.dto.GoodsSalesDTO;
import com.shop.entity.Orders;
import com.shop.mapper.OrderMapper;
import com.shop.mapper.UserMapper;
import com.shop.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 根据时间区间统计营业额
     * @param begin
     * @param end
     * @return
     */
    /**
     *这里体现了4个知识点：
     *
     * 日期之间用compareTo比较
     * LocalDate和LocalTime组合成LocalDateTime，用LocalDateTime的of方法
     * LocalTime.MIN与LocalTime.MAX
     * 用Map封装数据交给mapper查找。
     */
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);//日期计算，获得指定日期后1天的日期
            dateList.add(begin);
        }

        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("status", Orders.COMPLETED);
            map.put("begin",beginTime);
            map.put("end", endTime);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        //数据封装
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }

    /**
     * 用户统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);//日期计算，获得指定日期后1天的日期
            dateList.add(begin);
        }

        //存放每天总用户数量
        //select count(id) from user where creat_time > beginTime and creat_time < endTime
        List<Integer> totalUserList = new ArrayList<>();
        //存放每天新增用户数量
        //select count(id) from user where creat_time < endTime
        List<Integer> newUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap();
            map.put("end", endTime);
            Integer totalUser = userMapper.countByMap(map);

            map.put("begin", beginTime);
            Integer newUser = userMapper.countByMap(map);

            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        //封装结果数据
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .build();
    }

    /**
     * 订单统计
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {

        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);//日期计算，获得指定日期后1天的日期
            dateList.add(begin);
        }

        //存放订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放有效订单数
        List<Integer> validOrderCountList = new ArrayList<>();

        //遍历dateList集合，查询每天的有效订单数和订单总数
        for (LocalDate date : dateList) {
            //查询每天订单总数 select count(id) from orders where order_time > ? and order_time < ?
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = orderCount(beginTime, endTime, null);
            orderCountList.add(orderCount);
            //查询每天有效订单数select count(id) from orders where order_time > ? and order_time < ? and status = 5
            Integer validOrderCount = orderCount(beginTime, endTime, Orders.COMPLETED);
            validOrderCountList.add(validOrderCount);
        }

        //计算时间区间内的订单总数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //计算时间区间内的有效 订单总数
        Integer totalValidOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        Double orderCompletionRate = 0.0;
        if(totalOrderCount != 0) {
            //计算完成率
            orderCompletionRate = totalValidOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCountList(StringUtils.join(orderCountList,","))
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(totalValidOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 销量排名
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {

        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop(beginTime,endTime);

        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");

        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1、查询数据库，获取营业数据-----查询最近30天运营数据
        LocalDate dataBegin = LocalDate.now().minusDays(30);
        LocalDate dataEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dataBegin, LocalTime.MIN),
                LocalDateTime.of(dataEnd, LocalTime.MAX));

        //2、通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        System.out.println(in);
        try {
            //基于模板创建一个新的excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //获取表格文件Sheet页
            XSSFSheet sheet = excel.getSheetAt(0);
            //填充数据---时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dataBegin + "至" + dataEnd);

            //获取第四行数据
            XSSFRow row4 = sheet.getRow(3);
            row4.getCell(2).setCellValue(businessDataVO.getTurnover());//营业额
            row4.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());//完成率
            row4.getCell(6).setCellValue(businessDataVO.getNewUsers());//新增用户数

            //获取第5行
            XSSFRow row5 = sheet.getRow(4);
            row5.getCell(2).setCellValue(businessDataVO.getValidOrderCount());//有效订单
            row5.getCell(4).setCellValue(businessDataVO.getUnitPrice());//平均客单价

            //填充明细数据---30days
            for (int i = 0; i < 30; i++) {
                LocalDate date = dataBegin.plusDays(i);
                //查询一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData
                        (LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                XSSFRow row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3、通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //4、关闭资源
            out.close();
            excel.close();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private Integer orderCount(LocalDateTime beginTime,LocalDateTime endTime,Integer status) {
        Map map = new HashMap();
        map.put("begin",beginTime);
        map.put("end",endTime);
        map.put("status",status);

        return orderMapper.countByMap(map);
    }
}

